lib/ucs2be.h

   1 /*
   2  * Copyright (C) 1999-2001, 2016 Free Software Foundation, Inc.
   3  * This file is part of the GNU LIBICONV Library.
   4  *
   5  * The GNU LIBICONV Library is free software; you can redistribute it
   6  * and/or modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either version 2.1
   8  * of the License, or (at your option) any later version.
   9  *
  10  * The GNU LIBICONV Library is distributed in the hope that it will be
  11  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, see <https://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * UCS-2BE = UCS-2 big endian
  22  */
  23
  24 static int
  25 ucs2be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  26 {
  27   if (n >= 2) {
  28     if (s[0] >= 0xd8 && s[0] < 0xe0) {
  29       return RET_ILSEQ;
  30     } else {
  31       *pwc = (s[0] << 8) + s[1];
  32       return 2;
  33     }
  34   }
  35   return RET_TOOFEW(0);
  36 }
  37
  38 static int
  39 ucs2be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  40 {
  41   if (wc < 0x10000 && !(wc >= 0xd800 && wc < 0xe000)) {
  42     if (n >= 2) {
  43       r[0] = (unsigned char) (wc >> 8);
  44       r[1] = (unsigned char) wc;
  45       return 2;
  46     } else
  47       return RET_TOOSMALL;
  48   }
  49   return RET_ILUNI;
  50 }